From: Alex Elder <elder@inktank.com> To: Dan Carpenter <dan.carpenter@oracle.com> Cc: Sage Weil <sage@newdream.net>, ceph-devel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [patch -next] libceph: fix NULL dereference in reset_connection() Date: Tue, 19 Jun 2012 13:27:19 +0000 [thread overview] Message-ID: <4FE07E37.7000203@inktank.com> (raw) In-Reply-To: <20120619103339.GB7596@elgon.mountain> On 06/19/2012 05:33 AM, Dan Carpenter wrote: > We dereference "con->in_msg" on the line after it was set to NULL. > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Yikes. Actually I think I prefer a different fix, which is simply to call ceph_con_put(con) in the same spot it was called with con->in_msg->con before. I'd rather drop the message reference before dropping the connection reference. I.e.: @@ -440,7 +440,7 @@ static void reset_connection(struct ceph_connection *con) con->in_msg->con = NULL; ceph_msg_put(con->in_msg); con->in_msg = NULL; - ceph_con_put(con->in_msg->con); + ceph_con_put(con); } con->connect_seq = 0; (I crafted that manually--it may not work...) I will re-post that fix and will credit you with it. Please acknowledge it's OK with you though. Thanks a lot. -Alex > diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c > index 5e9f61d..6aa671c 100644 > --- a/net/ceph/messenger.c > +++ b/net/ceph/messenger.c > @@ -437,10 +437,10 @@ static void reset_connection(struct ceph_connection *con) > > if (con->in_msg) { > BUG_ON(con->in_msg->con != con); > + ceph_con_put(con->in_msg->con); > con->in_msg->con = NULL; > ceph_msg_put(con->in_msg); > con->in_msg = NULL; > - ceph_con_put(con->in_msg->con); > } > > con->connect_seq = 0; >
WARNING: multiple messages have this Message-ID (diff)
From: Alex Elder <elder@inktank.com> To: Dan Carpenter <dan.carpenter@oracle.com> Cc: Sage Weil <sage@newdream.net>, ceph-devel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: Re: [patch -next] libceph: fix NULL dereference in reset_connection() Date: Tue, 19 Jun 2012 08:27:19 -0500 [thread overview] Message-ID: <4FE07E37.7000203@inktank.com> (raw) In-Reply-To: <20120619103339.GB7596@elgon.mountain> On 06/19/2012 05:33 AM, Dan Carpenter wrote: > We dereference "con->in_msg" on the line after it was set to NULL. > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Yikes. Actually I think I prefer a different fix, which is simply to call ceph_con_put(con) in the same spot it was called with con->in_msg->con before. I'd rather drop the message reference before dropping the connection reference. I.e.: @@ -440,7 +440,7 @@ static void reset_connection(struct ceph_connection *con) con->in_msg->con = NULL; ceph_msg_put(con->in_msg); con->in_msg = NULL; - ceph_con_put(con->in_msg->con); + ceph_con_put(con); } con->connect_seq = 0; (I crafted that manually--it may not work...) I will re-post that fix and will credit you with it. Please acknowledge it's OK with you though. Thanks a lot. -Alex > diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c > index 5e9f61d..6aa671c 100644 > --- a/net/ceph/messenger.c > +++ b/net/ceph/messenger.c > @@ -437,10 +437,10 @@ static void reset_connection(struct ceph_connection *con) > > if (con->in_msg) { > BUG_ON(con->in_msg->con != con); > + ceph_con_put(con->in_msg->con); > con->in_msg->con = NULL; > ceph_msg_put(con->in_msg); > con->in_msg = NULL; > - ceph_con_put(con->in_msg->con); > } > > con->connect_seq = 0; >
next prev parent reply other threads:[~2012-06-19 13:27 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-19 10:33 [patch -next] libceph: fix NULL dereference in reset_connection() Dan Carpenter 2012-06-19 10:33 ` Dan Carpenter 2012-06-19 13:27 ` Alex Elder [this message] 2012-06-19 13:27 ` Alex Elder 2012-06-19 13:33 ` Dan Carpenter 2012-06-19 13:33 ` Dan Carpenter 2012-06-19 13:57 ` [PATCH] " Alex Elder 2012-06-19 13:57 ` Alex Elder
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